Title

Phase-field study of crack nucleation and propagation in elastic–perfectly plastic bodies

Document Type

Article

Publication Date

8-15-2019

Abstract

Crack initiation and propagation in elastic–perfectly plastic bodies is studied in a phase-field or variational gradient damage formulation. A rate-independent formulation that naturally couples elasticity, perfect plasticity and fracture is presented, and used to study crack initiation in notched specimens and crack propagation using a surfing boundary condition. Both plane strain and plane stress are addressed. It is shown that in plane strain, a plastic zone blunts the notch or crack tip which in turn inhibits crack nucleation and propagation. Sufficient load causes the crack to nucleate or unpin, but the crack does so with a finite jump. Therefore the propagation is intermittent or jerky leaving behind a rough surface. In plane stress, failure proceeds with an intense shear zone ahead of the notch or crack tip and the fracture process is not complete.

Publication Source (Journal or Book title)

Computer Methods in Applied Mechanics and Engineering

First Page

44

Last Page

65

This document is currently not available here.

Share

COinS